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Across 4. A representation of a chemical reaction in which the reactants and products are expressed as formulas 5. A substance that undergoes change in a chemical reaction 6. An atom or group of atoms that has a positive or negative charge 9. A mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal 11. The attraction between a metal cation and the shared electrons that surround it 12. The force that holds atoms or ions together as a unit

Down 1. Notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound 2. A diagram of an atom, ion or molecule in which each dot represents a valence electron 3. The force that holds cations and anions together 4. The energy stored in chemical bonds 7. A chemical bond in which two atoms share a pair of valence electrons 8. A neutral group of atoms that are joined together by one or more covalent bonds 10. New substances formed as a result of a chemical reaction